Key Terms & Concepts — UPSC Mains
Eco-Sensitive Zone (ESZ)
"A buffer area notified around a protected area under the Environment (Protection) Act, 1986, within which specific activities are regulated or prohibited to cushion the core protected area from surrounding land-use pressure."
An Eco-Sensitive Zone (also called an Ecologically Fragile Area) is a designated buffer notified under Section 3 of the Environment (Protection) Act, 1986, around a National Park, Wildlife Sanctuary or other ecologically significant area, within which specified categories of activity, such as mining, large construction, polluting industry or major hydroelectric projects, are prohibited, restricted or regulated, depending on a zone-specific master plan. The underlying purpose is to prevent land use immediately outside a protected area's boundary from undermining the ecological integrity the boundary itself is meant to secure, since threats to a protected area rarely respect the administrative line on a map. ESZ notification, in principle, follows scientific delineation: a zone's extent and permitted activities are meant to be based on ecological studies specific to the site rather than a fixed uniform radius applied everywhere. The Ministry of Environment, Forest and Climate Change issued general guidelines in 2011 suggesting a default minimum extent of 10 km around a protected area unless a site-specific study justifies otherwise, but final notification requires state-specific proposals, public consultation, and central approval, a process that has been chronically slow. The gap between the ESZ framework's intent and its execution is a recurring governance failure: for many protected areas across India, ESZs remain un-notified, notified only in draft form years after the process began, or subject to repeated redrafting, most visibly in the Western Ghats, where the Kasturirangan-based ecologically sensitive area notification has gone through seven successive drafts since 2014 without final notification. Courts, particularly in the T.N. Godavarman Thirumulpad continuing mandamus proceeding, have repeatedly stepped in with interim, uniform buffers, commonly a 10-km radius, precisely because the executive's site-specific ESZ process has not been completed on time; such judicial buffers are explicitly understood as a stop-gap that would become unnecessary once proper ESZs are notified.
A foundational, frequently tested GS3 concept in environmental governance and Prelims protected-area law; the distinction between a scientifically delineated ESZ and a blunt judicial default buffer is a high-value analytical point.
- 1 ESZ = buffer zone around a protected area, notified under Section 3 of the Environment (Protection) Act, 1986, regulating activities like mining and construction.
- 2 Purpose: prevent surrounding land use from undermining the ecological integrity of the core protected area.
- 3 2011 MoEFCC guidelines suggest a default 10 km minimum extent unless a site-specific study justifies a different boundary.
- 4 Final notification requires state proposals, public consultation and central approval, a process chronically delayed for many protected areas.
- 5 Western Ghats ESZ notification has seen seven successive drafts since 2014 (most recently 27 July 2026) without final notification.
- 6 Courts have repeatedly imposed uniform interim buffers (often 10 km) as a stop-gap where site-specific ESZs remain un-notified.
- 7 Distinct from Conservation Reserves and Community Reserves, which are protected-area categories rather than buffer zones around them.
The Supreme Court's 2026 order extending a 10-km mining restriction to wetland conservation reserves nationwide was explicitly framed as a judicial substitute for the scientifically delineated, site-specific Eco-Sensitive Zones that the executive has not yet notified.
